PT7M7433TAEX

PT7M7433/34/35 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| P Supervisory Circuit Features Description  User-Adjustable Low/High Thresholds with 615mV Internal Reference     Low Current (1.5μA typ) PT7M7427xx PT7M7428xx Single Low-Battery Outputs LBO Push-Pull LBO, Open-Drain LBO and 1Open-Drain LBO options GND 90ms Minimum LBO Timeout Period  Immune to Short Battery Voltage Transients 2  -40°C to + 85°C Operating Temperature Range The PT7M7433/34/35 are single-level battery monitors with internal hysteresis. These devices are offered with single low-battery output indicators which can be used PT7M7429xx to indicate three battery conditions: good (operate 1 LBO weak (operate system in lowsystem in normal mode), power mode), or empty (disable the system). 3The PT7M7433/34/35 are GND 3 user-adjustable threshold voltages permitting the user to select the hysteresis 2 BATT range and consequently the sensitivity of the system to noise. A wide hysteresis range also prevents chattering that can result due to battery recovery after load PT7M7432xx removal. SOT23-3 SOT23-5 Application  BATT PT7M7430xx PT7M7431xx Monitoring lithiumion (Li+) cells or multicell alkaline/ 1 GND LBOL NiCd/ NiMH power supplies. 2 NC 3 LBOH BATT 5 4 1 GND 2 NC 3 LBOH LBOL 5 BATT 4 Pin Configuration PT7M7433 PT7M7434 1 HTHIN 2 GND 3 LTHIN VCC LBO PT7M7479H PT7M7479L PT7M7435 5 4 1 HTHIN 2 GND 3 LTHIN VCC LBO 5 4 1 HTH 2 GND 3 LTH VDD 5 RST 4 (/RST) SOT23-6 Pin Description Pin PT7M7436 PT7M7437 Name PT7M7438 PT7M3806M PT7M3806E Type 1 1 HTHIN I 2 GND P2 3 LTHIN I 3 4 LBO/LBO O 5 VCC P Description 6 1 network RSTSENSE HSENSE 6 resistor-divider sets the high threshold associated with LBO/LBO. GND Ground LBOH 5 2 GND 2 GND LSENSE 5 LBOH 5 LTH Threshold Monitor Input. A resistor-divider network sets the low LBO/LBO. LTHINthreshold LBOL 4 associated with 3 LTHIN 3 RESET VCC 4 LBOL 4 Low-Battery Output. LBO /LBO is asserted when LTHIN drops below V LTHIN, and remains asserted for at least 90ms HTHIN rises above V HTHIN. Push-pull output for PT7M7433. Open drain output for PT7M7434/35. HTHINHTH VCCThreshold 6 1 HTHIN Monitor Input.VCC A Supply Voltage. Device power supply for adjustable threshold versions. 12-07-0002 PT0213-4 1 07/05/12 PT7M7433/34/35 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Block Diagram PT7M7433/34/35Block Diagram VCC R1 VCC LTHIN R2 R Q S Q HTHIN R3 VCC EXTERNAL RESISTORDRIVER LBO TIMOUT PERIOD 615 mV LBO (LBO) LBO: PT7M7433/34 LBO: PT7M7435 Maximum Ratings Storage Temperature ............................................................-65 C to +150 C Ambient Temperature with Power Applied.......................... -40oC to +85oC Supply Voltage to Ground Potential (Vcc to GND) ..............-0.3V to +7.0V DC Input Voltage (All inputs except Vcc and GND)......-0.3V to VCC+0.3V DC Output Current (All outputs) ..........................................................20mA Power Dissipation .............................................................................. 320mW o o (Depend on package) 12-07-0002 Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. PT0213-4 2 07/05/12 PT7M7433/34/35 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| DC Electrical Characteristics (VCC =1.8V to 5.5V, TA= -40~85ºC, unless otherwise noted. Typical values are at T A = +25ºC) Description Symbol Test Conditions Min Typ Max Unit 1.8 - 5.5 V - 1.5 2.5 μA VCC ≥ 1.6V, Isource = 200μA 0.8×Vcc - - VCC ≥ 2.7V, Isource = 500μA 0.8×Vcc - - VCC ≥ 4.5V, Isource = 800μA 0.8×Vcc - - VCC ≥ 1.6V, Isink = 100μA - - 0.3 VCC ≥ 2.7V, Isink = 1.2mA - - 0.3 VCC ≥ 4.5V, Isink = 3.2mA - - 0.4 ILKG - - - 1 μA ILKG VHTHIN or VLTHIN > 400mV - - 20 nA -1.5 - +1.5 % -2.5 - -2.5 % -1.5 - +1.5 % -2.5 - -2.5 % Operating Voltage Range VCC TA= -40~85ºC VCC Supply Current ICC VCC = 3.7V, no load TA= -40~85ºC Output High Voltage (Push-Pull only) VOH Output Low Voltage VOL Open-Drain Output Leakage Current Input Leakage Current User-adjustable Thresholds (PT7M7433/34/35) HTHIN rising, LBO is TA= 25ºC HTHIN Threshold(Note) VHTHIN deasserted when HTHIN TA= -30~70ºC rises above 615mV. LTHIN falling, LBO is TA= 25ºC LTHIN Threshold(Note) VLTHIN asserted when LTHIN falls TA= -30~70ºC below 615mV. Note: Typical value is 615mV. Minimum and Maximum value is percentage of typical value. V V AC Electrical Characteristics Fig 1. PT7M7433/34/35 timing diagram VHTH VCC VLTH tLBOP tLBOD tLBOP tLBOD LBO (PT7M7433/34) LBO (PT7M7435) (VCC =1.8V to 5.5V, TA= -40~85ºC, unless otherwise noted. Typical values are at TA = +25ºC) Symbol Description Test Conditions Min Typ Max Unit tLBOP Timeout period - 90 200 350 ms tLBOD Delay - - 70 - s 12-07-0002 PT0213-4 3 07/05/12 PT7M7433/34/35 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Function Description The PT7M7433/34/35 are available with user adjustable monitoring. The user sets the threshold voltages for the PT7M7433/34/35, which permit the user to select the hysteresis range, and consequently the sensitivity of the system to noise. A wide hysteresis range prevents chattering that can result during battery recovery or load removal. The PT7M7433/34/35 have single low-battery outputs. The PT7M7433/34/35 combine a 615mV reference with two comparators, logic, and timing circuitry to provide the user with information about the charge state of the power-supply batteries. The PT7M7433/34/35 monitor separate high-voltage and lowvoltage thresholds to determine battery status. The output can be used to signal when the battery is charged, when the battery is low, and when the battery is empty. PT7M7433/34/35 are also available with thresholds determined using an external resistordivider (see Application information Resistor-Value Selection). The adjustable versions can monitor down to 0.62V, making them suitable for monitoring single-cell alkaline, NiMH, and NiCd applications (VCC ≥1.8V). When the power-supply voltage drops below the specified low threshold, the low-battery output asserts (see Low-Battery Output). When the voltage rises above the specified high threshold following a 90ms (min) time-out period, the low-battery output is deasserted (see Threshold Monitoring). This ensures the supply voltage has stabilized before power-converter or microprocessor activity is enabled. Low-Battery Output The low-battery outputs are available in active-low (LBO, push-pull and open-drain) and action-high (LBO open-drain) configurations. Push-pull outputs are referenced to VCC (for adjustable threshold versions). The open-drain devices can be pulled to a voltage independent of VCC or BATT, up to 5.5V. This allows the device to monitor and operate from direct battery voltage while interfacing to higher voltage microprocessors. The PT7M7433/34/35 single-output voltage monitors provide a single low-battery output, LBO/LBO. The PT7M7433/34 adjustable-threshold parts assert LBO/LBO when the LTHIN input drops below the VLTHIN threshold (615mV). Threshold Monitoring The PT7M7433/34/35 HTHIN and LTHIN inputs are high-impedance inputs to comparators. An external resistor divider network is required between the monitored voltage, HTHIN, LTHIN, and GND to select the desired thresholds (see Application information Resistor-Value Selection). The PT7M7433/34/35 single-output voltage monitors assert LBO /LBO when LTHIN drops below the internal LTHIN reference (615mV). LBO/LBO is deasserted when HTHIN rises above the internal HTHIN reference level (615mV) for at least 90ms (see AC Electrical Characteristics: Fig 1). Hysteresis Hysteresis increases the comparator’s noise margin by increasing the upper threshold or decreasing the lower threshold (see blow). The hysteresis prevents the output from oscillating (chattering) when VCC is near the low-battery threshold. This is especially important for applications where the load on the battery creates significant fluctuations in battery voltages. Adjustable Hysteresis (PT7M7433/34/35) Block diagram shows the correct connections for the external resistor-dividers. To adjust the low-battery threshold and hysteresis connect resistor R1 between VCC and LTHIN, resistor R2 between LTHIN and HTHIN, and R3 between HTHIN and GND. The hysteresis for the PT7M7433/34/35 is determined by an external resistor-divider network (see Application information ResistorValue Selection). 12-07-0002 PT0213-4 4 07/05/12 PT7M7433/34/35 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Fig 2. PT7M7433/34/35 adjustable hysteresis VHTH VHYST VBATT VLTH tLBCP LBO HTH – Battery voltage good enable operation LTH – Battery voltage low suspend/disable operation Application Information Resistor-Value Selection (Programming the Adjustable Thresholds) VREF = VLTHIN = VHTHIN = 615mV VTRIPLOW = VLTH = VREF ( R1 + R2 + R3 ) R2 + R3 VTRIPHIGH = VHTL = VREF ( R1 + R2 + R3 ) R3 RTOTAL = R1 + R2 + R3 Use the following steps to determine values for R1, R2, and R3 of Functional Block Diagram. 1) Choose a value for RTOTAL. Because the PT7M7433/34/35 have very high input impedance, RTOTAL can be up to 5MΩ. 2) Calculate R3 based on RTOTAL and the desired upper trip point: R3 = VREF × RTOTAL VTRIPHIGH = 615mV × RTOTAL VTRIPHIGH 3) Calculate R2 based on RTOTAL, R3, and the desired lower trip point: R2 = 615mV × RTOTAL VTRIPLOW - R3 4) Calculate R1 based on RTOTAL, R3, and R2: R1 = RTOTAL – R2 – R3 12-07-0002 PT0213-4 5 07/05/12 PT7M7433/34/35 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Mechanical Information TAE (Lead free and Green SOT23-5) PKG. DIMENSIONS(MM) SYMBOL MIN MAX A 1.05 1.25 A1 0.00 0.10 A2 1.05 1.15 b 0.30 0.50 c 0.10 0.20 Note: 1) Controlling dimensions in millimeters. 2) Ref : JEDEC MO-178C/AA D 2.82 E E1 e e1 L 1.50 1.70 2.65 2.95 0.95BSC 1.80 2.00 0.30 0.60 0° 8° θ 12-07-0002 3.02 PT0213-4 6 07/05/12 PT7M7433/34/35 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Ordering Information Part Number PT7M7433TAE PT7M7434TAE PT7M7435TAE Package Code TA TA TA Package lead-free and Green SOT23-5 lead-free and Green SOT23-5 lead-free and Green SOT23-5 Marking Code MM MN MO Note:  E = Pb-free and Green  Adding X Suffix= Tape/Reel Table 1. Function comparison of PT7M7433/34/35 Output Item Part No. Open-Drain Push-Pull Active high Active low Active low 1 PT7M7433  2 PT7M7434  3 PT7M7435  Single Dual    - Threshold Factory User fixed adjustable    SOT-23 Package Top Marking Instruction MM PJ PART NO. 2 BIT CODE (See Table1) Sample: MMPJ Lead-Free Sign -: lead-free and Green DATE CODE YEAR & WORK WEEK PART NO.: PT7M7433 DATE CODE: YEAR 2005 WW10 Lead free and Green package 1. 2. 3. 4. Package Type: SOT-23 Package Code: TA 2005-Year Code: P Work Week Code: WW7-G WW8-H WW9-I WW10-J WW11-K WW12-L WW13-M WW14-N WW15-O WW16-P WW17-Q 5. Font Style: HELVETICA or ARIAL 6. Max Characters Per Line (Only 1 line): 4 7. Max Characters Height: 0.8 mm 8. Min Characters Height: 0.6 mm 9. Max Characters Width: 0.6 mm 10. Mark Placement: Center Pericom Semiconductor Corporation  1-800-435-2336  www.pericom.com Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom. 12-07-0002 PT0213-4 7 07/05/12